User device incorporating multi-sensing sensor device

ABSTRACT

A device may include a sensor window. The sensor window may include a substrate. The sensor window may include a set of layers disposed onto the substrate. The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index. The set of layers may be associated with a threshold transmissivity in a sensing spectral range, and may be configured to a particular color in a visible spectral range and associated with a threshold opacity in the visible spectral range. The device may include a spectral sensor device aligned to the sensor window and including at least one sensor element to receive light in the sensing spectral range and provide a plurality of sensing functionalities based on at least one measurement of the light in the sensing spectral range.

RELATED APPLICATION(S)

This application claims priority under 35 U.S.C. § 119 to U.S.Provisional Patent Application No. 62/678,014, filed on May 30, 2018,the content of which is incorporated by reference herein in itsentirety.

BACKGROUND

A user device may include a camera. For example, a user device mayinclude a camera that captures images of an object, of a user, and/orthe like. The user device may also include one or more other types ofsensor devices. For example, some user devices may include a fingerprintreader to determine an identity of a user and to perform a securityfunction. Similarly, some user devices may include a heart rate monitorto measure a pulse of the user and to perform a health function. Someuser devices may connect to external peripherals to perform one or morefunctions. For example, a user device may connect to an external heartrate monitor worn by a user to enable the external heart rate monitor tomonitor a pulse of the user. Similarly, external peripherals may be usedto monitor blood oxygenation, to perform fingerprint scanning, and/orthe like for a user device.

SUMMARY

According to some possible implementations, a device may include asensor window. The sensor window may include a substrate. The sensorwindow may include a set of layers disposed onto the substrate. The setof layers may include a first subset of layers of a first refractiveindex and a second set of layers of a second refractive index differentfrom the first refractive index. The set of layers may be associatedwith a threshold transmissivity in a sensing spectral range, and may beconfigured to a particular color in a visible spectral range andassociated with a threshold opacity in the visible spectral range. Thedevice may include a spectral sensor device aligned to the sensor windowand including at least one sensor element to receive light in thesensing spectral range and provide a plurality of sensingfunctionalities based on at least one measurement of the light in thesensing spectral range.

According to some possible implementations, an optical device mayinclude a plurality of sensor elements. The optical device may include aplurality of layers. The plurality of layers may include a set of highrefractive index layers associated with a first refractive index and aset of low refractive index layers associated with a second refractiveindex that is less than the first refractive index. The plurality oflayers may form a plurality of channels to direct a plurality ofwavelengths of light. The plurality of layers may be associated with athreshold transmissivity in a sensing spectral range and a thresholdopacity in a visible spectral range. The plurality of sensor elementsmay be aligned to the plurality of channels and configured to perform ahealth parameter monitoring determination and a biometric identificationdetermination based on measurements of the plurality of wavelengths oflight.

According to some possible implementations, a sensor device may includea sensor element array including a plurality of sensor elements. Thesensor element array may be configured to perform a plurality ofmeasurements of a plurality of wavelengths of light. The sensor elementarray may be configured to provide information identifying a pluralityof characteristics of an object based on the plurality of measurements.The sensor device may include a multispectral filter including a set ofhigh refractive index layers and low refractive index layers. Themultispectral filter may be configured to direct the plurality ofwavelengths of light to the sensor element array.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are diagrams of an example implementation describedherein.

FIG. 2 is a diagram of an example environment in which systems and/ormethods described herein may be implemented.

FIG. 3 is a diagram of example components of one or more devices of FIG.2.

FIG. 4 is a diagram of an example implementation described herein.

FIG. 5 is a diagram of an example implementation described herein.

DETAILED DESCRIPTION

The following detailed description of example implementations refers tothe accompanying drawings. The same reference numbers in differentdrawings may identify the same or similar elements.

A user device may include sensor devices to perform sensingfunctionalities. An optical transmitter, of a sensor device, may emitlight that is directed toward an object. For example, in an objectdetection system, the optical transmitter may transmit near-infraredlight toward an object, and the near-infrared light may be reflected offthe object toward the sensor device. An optical receiver of a sensordevice, such as a sensor element array, may receive light that isdirected toward the sensor device. For example, in the object detectionsystem, a sensor element array may capture information about one or morewavelengths of light. The sensor element array may include a set ofsensor elements (e.g., optical sensors, spectral sensors, and/or imagesensors) that capture the information about the one or more wavelengthsof light. In this way, based on the information about the one or morewavelengths of light, the sensor device may detect an object.

Similarly, information captured by an optical receiver of a sensordevice may be used to recognize a characteristic of an object. Forexample, the sensor device may utilize information regarding wavelengthsof light reflected off an object to determine a distance to the object,a size of the object, a shape of the object, a spectroscopic signatureof the object, a type of the object, a speed of the object, and/or thelike. Similarly, the sensor device may determine an identity of aperson, a characteristic of the person (e.g., a height, a weight, aspeed of movement, a health characteristic, and/or the like), and/or thelike.

Some user devices, such as mobile phones, wearable devices (e.g., asmart wristwatch or a pair of smart eyeglasses), and/or the like, mayinclude multiple sensor devices to perform multiple sensingfunctionalities. For example, a user device may include a camera tocapture an image, a fingerprint reader to provide a fingerprintidentification functionality, and/or the like. Similarly, the userdevice may connect to external peripherals to provide functionalities,such as connecting to an external heart rate monitor to provide a healthparameter monitoring functionality. However, including multiple,discrete sensor devices in a user device may result in excessive cost,excessive package size, excessive utilization of power resources, and/orexcessive utilization of processing resources. Moreover, connecting toan external peripheral may result in excessive cost and/or package sizeto provide connectivity functionalities, excessive traffic via a networkconnection, and/or the like.

Some implementations described herein may provide a user deviceincorporating a multi-sensing sensor device. For example, the userdevice may include a multispectral filter and a sensor device thatprovides sensing for a plurality of functionalities, such as performingone or more health monitoring functionalities, one or more securityfunctionalities, and/or the like. In this way, the user device may beassociated with a reduced package size, a reduced cost, a reducedutilization of power resources, a reduced utilization of networkresources, and/or the like relative to incorporating multiple, discretesingle-functionality sensor devices and/or connecting to multipleexternal peripherals.

FIGS. 1A and 1B are diagrams of an example implementation 100 describedherein. As shown in FIG. 1A, example 100 may include a user deviceincluding a sensor device and a sensor window. In some implementations,the sensor window may be opaque in a visible spectral range andtransmissive in a sensing spectral range (e.g., a near-infrared spectralrange, a mid-infrared spectral range, and/or the like). In someimplementations, the sensor window may be configured to be a particularcolor in the visible spectral range to match an adjacent surface of theuser device to conceal the sensor device. In some implementations, thesensor window may protect the sensor device from an externalenvironment, thereby improving durability of the sensor device relativeto providing an exposed sensor device.

As further shown in FIG. 1A, the sensor device may transmit light toperform a spectroscopic measurement, and may receive reflected light toenable the spectroscopic measurements. In some implementations, thesensor device may determine a biometric authentication based on a tissuestructure in a finger (e.g., based on receiving light reflected offcapillaries and/or veins in the finger and determining the vascularstructure in the finger). For example, the sensor device may transmitnear-infrared light through the sensor window to enable subcutaneousbiometric authentication (e.g., identification of a tissue structure ofthe finger or another body part). In this case, based on using asubcutaneous identification technique (e.g., sensing to a penetrationdepth of greater than approximately 0.1 microns, greater thanapproximately 0.5 microns, greater than approximately 1 micron, greaterthan approximately 3 microns, greater than approximately 5 microns,and/or the like), the sensor device improves an accuracy of biometricauthentication relative to surface-based fingerprint identificationtechniques, which may be hindered by surface damage to a finger, dirt onthe finger, water on the finger, and/or the like.

Additionally, or alternatively, the sensor device may transmit thenear-infrared light to enable a heart rate determination. For example,the sensor device may transmit near-infrared light toward the user'shand, may receive reflected light, and may detect a pulse of the userbased on measurements of one or more wavelengths of the reflected light.Based on the heart rate determination, the sensor device may determine aliveness of an object. For example, the sensor device may distinguishbetween an artificial imprint of a fingerprint or tissue structure and afingerprint or tissue structure on an actual, living person, therebyimproving a security of a biometric authentication functionality. Insome implementations, the sensor device may perform anotherdetermination, such as a blood oxygenation determination, a blood sugarlevel determination, and/or the like based on measurements of one ormore wavelengths of reflected light. Additionally, or alternatively, thesensor device may perform a spectroscopic classification,quantification, and/or the like using measurements of near-infraredlight. In this way, by using surface measurements and subsurfacemeasurements, the sensor device improves sensing for the user device.

As shown in FIG. 1B, the user device may provide, via a user interface,object information based on the sensor device performing measurements(e.g., spectroscopic measurements). For example, the sensor device mayprovide information identifying a user based on a fingerprint,information identifying a heart rate, information indicating that afingerprint was from a person and not an artificial imprint, informationidentifying a blood oxygenation level, and/or the like via the userinterface. In some implementations, the user device may perform aresponse action based on the sensor determination. For example, the userdevice may automatically unlock a user interface of the user devicebased on a biometric authentication and a liveness determination.Additionally, or alternatively, the user device may automatically altera layout of a screen and/or one or more preferences of the user devicebased on user stored preferences and based on identifying the user usinga biometric authentication and a liveness determination. Additionally,or alternatively, the user device may automatically transmit an alert(e.g., to an emergency response dispatch device) identifying the user,identifying a location of the user, and indicating a health conditionbased on a biometric authentication and one or more health metrics(e.g., a heart rate determination, a blood oxygenation determination, ablood sugar level determination, and/or the like).

In this way, based on using a single sensor device to perform, forexample, a biometric authentication and a heart rate determination, theuser device may be associated with a reduced size, reduced cost, reducedcomplexity, reduced utilization of power resources, reduced utilizationof network, and/or the like relative to a user device with multiple,discrete, single-functionality sensor devices.

As indicated above, FIGS. 1A and 1B are provided merely as one or moreexamples. Other examples may differ from what is described with regardto FIGS. 1A and 1B.

FIG. 2 is a diagram of an example environment 200 in which systemsand/or methods described herein may be implemented. As shown in FIG. 2,environment 200 may include a user device 210, which includes a sensordevice 220, a server device 230, and a network 240. Devices ofenvironment 200 may interconnect via wired connections, wirelessconnections, or a combination of wired and wireless connections.

User device 210 includes one or more devices capable of receiving,generating, storing, processing, and/or providing information associatedwith a sensor determination. For example, user device 210 may include acommunication and/or computing device, such as a mobile phone (e.g., asmart phone, a radiotelephone, and/or the like), a computer (e.g., alaptop computer, a tablet computer, a handheld computer, and/or thelike), a gaming device, a wearable communication device (e.g., a smartwristwatch, a pair of smart eyeglasses, and/or the like), or a similartype of device. In some implementations, user device 210 may include ahousing that houses sensor device 220. In some implementations, thehousing may include a sensor window that separates sensor device 220from an external environment. For example, the sensor window may be amultispectral filter to filter light, may be opaque at visible lightwavelengths, may be transmissive at sensing wavelengths (e.g.,near-infrared wavelengths, mid-infrared wavelengths, and/or the like),and/or the like. In some implementations, sensor device 220 may bedisposed in user device 210 (e.g., on a back of user device 210, behinda display of user device 210, and/or the like). For example, when sensordevice 220 is disposed behind the display of user device 210, thedisplay of user device 210 may form a sensor window for user device 210.In some implementations, user device 210 may receive information fromand/or transmit information to another device in environment 200, suchas sensor device 220 and/or server device 230.

Sensor device 220 may include an optical device capable of storing,processing, and/or routing information associated with sensordetermination and/or one or more devices capable of performing a sensormeasurement on an object. For example, sensor device 220 may include aspectrometer device that performs spectroscopy (e.g., vibrationalspectroscopy, such as a near infrared (NIR) spectrometer, a mid-infraredspectroscopy (mid-IR), Raman spectroscopy, and/or the like). In someimplementations, sensor device 220 may perform multiple characteristicdeterminations for multiple characteristics of an object for user device210, thereby obviating a need for user device 210 to include multiplesensor devices. For example, sensor device 220 may provide a healthparameter monitoring determination, a biometric authenticationdetermination, a liveness detection determination, a blood pressuredetermination, a blood oxygenation determination, and/or the like touser device 210, as described herein. In this case, sensor device 220may utilize the same wavelengths, different wavelengths, a combinationof the same wavelengths and different wavelengths, and/or the like forthe multiple characteristic determinations.

In some implementations, sensor device 220 may be incorporated into userdevice 210, such as a wearable spectrometer and/or the like. In someimplementations, sensor device 220 may generate a classification modelbased on a set of measurements of a training set, validate theclassification model based on a set of measurements of a validation set,and/or utilize the classification model to perform spectroscopicclassification or quantification based on a set of measurements of anunknown set (e.g., an object on which a sensor measurement is to beperformed). In some implementations, sensor device 220 may include asensor element array to perform measurements of multiple wavelengths oflight for multiple sensing functionalities. In some implementations,sensor device 220 may receive information from and/or transmitinformation to another device in environment 200, such as user device210 and/or server device 230.

Server device 230 includes one or more devices capable of storing,processing, and/or routing information associated with a sensordetermination. For example, server device 230 may include a server thatreceives information identifying a spectroscopic measurement from userdevice 210, performs a determination regarding the spectroscopicmeasurement (e.g., determines a heart rate based on the spectroscopicmeasurement, an identification of a user based on the spectroscopicmeasurement, and/or the like), and provides information identifying thedetermination to user device 210. In some implementations, server device230 may include a communication interface that allows server device 230to receive information from and/or transmit information to other devicesin environment 200.

Network 240 includes one or more wired and/or wireless networks. Forexample, network 240 may include a cellular network (e.g., a long-termevolution (LTE) network, a code division multiple access (CDMA) network,a 3G network, a 4G network, a 5G network, another type of nextgeneration network, etc.), a public land mobile network (PLMN), a localarea network (LAN), a wide area network (WAN), a metropolitan areanetwork (MAN), a telephone network (e.g., the Public Switched TelephoneNetwork (PSTN)), a private network, an ad hoc network, an intranet, theInternet, a fiber optic-based network, a cloud computing network, or thelike, and/or a combination of these or other types of networks.

The number and arrangement of devices and networks shown in FIG. 2 areprovided as an example. In practice, there may be additional devicesand/or networks, fewer devices and/or networks, different devices and/ornetworks, or differently arranged devices and/or networks than thoseshown in FIG. 2. Furthermore, two or more devices shown in FIG. 2 may beimplemented within a single device, or a single device shown in FIG. 2may be implemented as multiple, distributed devices. For example,although sensor device 220 and user device 210 are described as separatedevices, sensor device 220 and user device 210 may be implemented as asingle device. Additionally, or alternatively, a set of devices (e.g.,one or more devices) of environment 200 may perform one or morefunctions described as being performed by another set of devices ofenvironment 200.

FIG. 3 is a diagram of example components of a device 300. Device 300may correspond to user device 210, sensor device 220, and/or serverdevice 230. In some implementations, user device 210, sensor device 220,and/or server device 230 may include one or more devices 300 and/or oneor more components of device 300. As shown in FIG. 3, device 300 mayinclude a bus 310, a processor 320, a memory 330, a storage component340, an input component 350, an output component 360, and acommunication interface 370.

Bus 310 includes a component that permits communication among multiplecomponents of device 300. Processor 320 is implemented in hardware,firmware, and/or a combination of hardware and software. Processor 320is a central processing unit (CPU), a graphics processing unit (GPU), anaccelerated processing unit (APU), a microprocessor, a microcontroller,a digital signal processor (DSP), a field-programmable gate array(FPGA), an application-specific integrated circuit (ASIC), or anothertype of processing component. In some implementations, processor 320includes one or more processors capable of being programmed to perform afunction. Memory 330 includes a random access memory (RAM), a read onlymemory (ROM), and/or another type of dynamic or static storage device(e.g., a flash memory, a magnetic memory, and/or an optical memory) thatstores information and/or instructions for use by processor 320.

Storage component 340 stores information and/or software related to theoperation and use of device 300. For example, storage component 340 mayinclude a hard disk (e.g., a magnetic disk, an optical disk, amagneto-optic disk, and/or a solid state disk), a compact disc (CD), adigital versatile disc (DVD), a floppy disk, a cartridge, a magnetictape, and/or another type of non-transitory computer-readable medium,along with a corresponding drive.

Input component 350 includes a component that permits device 300 toreceive information, such as via user input (e.g., a touch screendisplay, a keyboard, a keypad, a mouse, a button, a switch, and/or amicrophone). Additionally, or alternatively, input component 350 mayinclude a sensor for sensing information (e.g., a multispectral sensorcoupled to a multispectral filter, a sensor element array, a globalpositioning system (GPS) component, an accelerometer, a gyroscope,and/or an actuator). Output component 360 includes a component thatprovides output information from device 300 (e.g., a display, a speaker,and/or one or more light-emitting diodes (LEDs), an optical transmitterto transmit a near-infrared signal).

Communication interface 370 includes a transceiver-like component (e.g.,a transceiver and/or a separate receiver and transmitter) that enablesdevice 300 to communicate with other devices, such as via a wiredconnection, a wireless connection, or a combination of wired andwireless connections. Communication interface 370 may permit device 300to receive information from another device and/or provide information toanother device. For example, communication interface 370 may include anEthernet interface, an optical interface, a coaxial interface, aninfrared interface, a radio frequency (RF) interface, a universal serialbus (USB) interface, a Wi-Fi interface, a cellular network interface, orthe like.

Device 300 may perform one or more processes described herein. Device300 may perform these processes based on processor 320 executingsoftware instructions stored by a non-transistory computer-readablemedium, such as memory 330 and/or storage component 340. Acomputer-readable medium is defined herein as a non-transitory memorydevice. A memory device includes memory space within a single physicalstorage device or memory space spread across multiple physical storagedevices.

Software instructions may be read into memory 330 and/or storagecomponent 340 from another computer-readable medium or from anotherdevice via communication interface 370. When executed, softwareinstructions stored in memory 330 and/or storage component 340 may causeprocessor 320 to perform one or more processes described herein.Additionally, or alternatively, hardware circuitry may be used in placeof or in combination with software instructions to perform one or moreprocesses described herein. Thus, implementations described herein arenot limited to any specific combination of hardware circuitry andsoftware.

The number and arrangement of components shown in FIG. 3 are provided asan example. In practice, device 300 may include additional components,fewer components, different components, or differently arrangedcomponents than those shown in FIG. 3. Additionally, or alternatively, aset of components (e.g., one or more components) of device 300 mayperform one or more functions described as being performed by anotherset of components of device 300.

FIG. 4 is a diagram of an example implementation 400 described herein.As shown in FIG. 4, example implementation 400 includes sensor device220 incorporated into user device 210. User device 210 includes a sensorwindow 410, which is disposed on a substrate 420, and a sensor elementarray 430 of sensor device 220. In some implementations, sensor window410 may be an optical filter that performs a filtering functionality.For example, sensor window 410 may include alternating high refractiveindex material layers and low refractive index material layers toprovide color selectivity and to direct light to multiple sensorelements of sensor element array 430 associated with multiple wavelengthchannels.

As further shown in FIG. 4, and by reference number 440, an inputoptical signal is directed toward sensor window 410. The input opticalsignal may include but is not limited to light associated with aparticular spectral range (e.g., a near-infrared spectral range, amid-infrared spectral range, a visible spectral range, and/or the like).For example, an optical transmitter (e.g., of sensor device 220 and/oruser device 210) may direct the light toward sensor element array 430 topermit sensor element array 430 to perform a measurement of the light(e.g., the optical transmitter may direct the light toward an object andthe light may be reflected toward sensor element array 430). In someimplementations, the input optical signal may be reflected ambient lightdirected toward sensor element array 430 (e.g., without a signaltransmitted toward an object to cause light to be reflected towardsensor element array 430).

As further shown in FIG. 4, and by reference number 450, a first portionof the input optical signal with a first spectral range is not passedthrough by sensor window 410. For example, dielectric filter stacks ofdielectric thin film layers, which may include high index materiallayers and low index material layers of sensor window 410, may cause thefirst portion of the input optical signal to be reflected in a firstdirection, to be absorbed, and/or the like. In some implementations, thefirst portion of the input optical signal may include first light thatis reflected to cause sensor window 410 to appear to a viewer as opaqueand/or with a particular color and second light that is absorbed. Insome implementations, the first portion of the input optical signal maybe a threshold portion of light incident on sensor window 410 notincluded in a bandpass of sensor window 410, such as greater than 95% oflight, greater than 99% of light, and/or the like in a visible spectralrange. Additionally, or alternatively, sensor window 410 may betransmissive in at least a part of the visible spectral range, such asto enable visible light imaging by sensor element array 430, therebyobviating a need for a separate camera in user device 210.

As further shown in FIG. 4, and by reference number 460, a secondportion of the input optical signal is passed through by sensor window410. For example, sensor window 410 may pass through the second portionof the input optical signal with a second spectral range in a seconddirection toward sensor element array 430. In this case, the secondportion of the input optical signal may be a threshold portion of lightincident on sensor window 410 within a bandpass of sensor window 410,such as greater than 50% of incident light, greater than 90% of light,greater than 95% of light, greater than 99% of light, and/or the like ina near-infrared spectral range. In some implementations, sensor window410 may be associated with multiple component filters associated withmultiple spectral ranges. For example, based on varying a thickness ofsensor window 410 and/or a thickness of a subset of layers thereof,different portions of sensor window 410 may pass different wavelengthsof light to different sensor elements of sensor element array 430,thereby enabling multispectral sensing.

As further shown in FIG. 4, and by reference number 470, based on thesecond portion of the input optical signal being passed to sensorelement array 430, sensor element array 430 may provide an outputelectrical signal for sensor device 220, such as for use in identifyinga fingerprint, determining a heart rate, imaging, ambient light sensing,detecting the presence of an object, identifying a person, performing ameasurement, facilitating communication, and/or the like. In someimplementations, another arrangement of sensor window 410 and sensorelement array 430 may be utilized. For example, rather than passing thesecond portion of the input optical signal collinearly with the inputoptical signal, sensor window 410 may direct the second portion of theinput optical signal in another direction toward a differently locatedsensor element array 430.

Although some implementations described herein are described in terms ofa sensor element array, other types of sensor device 220 configurationsmay be possible, such as a set of discrete sensor elements or anothertype of optical sensor.

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 4.

FIG. 5 is a diagram of an example optical filter 500. FIG. 5 shows anexample stackup of an optical filter described herein. As further shownin FIG. 5, optical filter 500 includes an optical filter coating portion510 and a substrate 520. In some implementations, optical filter 500 mayform a sensor window, such as sensor window 410 of FIG. 4.

Optical filter coating portion 510 includes a set of optical filterlayers. For example, optical filter coating portion 510 includes a firstset of layers 530-1 through 530-(N+1) (N≥1) and a second set of layers540-1 through 540-N. In another example, optical filter coating portion510 may be a single type of layer (e.g., one or more layers 530), threeor more types of layers (e.g., one or more layers 530, one or morelayers 540, and one or more of one or more other types of layers),and/or the like. In some implementations, optical filter coating portion510 may be disposed on a single side of substrate 520, on multiple sidesof substrate 520, and/or the like.

In some implementations, layers 530 may include a set of layers of ahigh refractive index material (H layers), such as silicon layers,hydrogenated silicon layers, silicon-germanium (SiGe) layers,hydrogenated germanium layers, hydrogenated silicon-germanium layers,and/or the like. In some implementations, layers 530 may be associatedwith a refractive index of greater than approximately 3.0, greater thanapproximately 3.5, greater than approximately 3.6, greater thanapproximately 3.8, greater than approximately 4.0, and/or the like.Although some layers may be described as a particular material, such asSiGe, some layers may include (small quantities of) phosphor, boron,nitride, hydrogen, a noble gas, and/or the like.

In some implementations, layers 540 may include a set of layers of a lowrefractive index material (L layers), such as silicon dioxide layersand/or the like. Additionally, or alternatively, the L layers mayinclude tantalum pentoxide (Ta₂O₅) layers, niobium pentoxide (Nb₂O₅)layers, titanium dioxide (TiO₂) layers, aluminum oxide (Al₂O₃) layers,zirconium oxide (ZrO₂) layers, yttrium oxide (Y₂O₃) layers, siliconnitride (Si₃N₄) layers, magnesium fluoride (MgF₂) layers, niobiumtitanium fluoride (NbTiF) layers, niobium titanium oxide (NbTiO) layers,an anion/cation mixture layer, a combination thereof, and/or the like.In some implementations, layer 540 may be associated with a refractiveindex of less than approximately 2.5, less than approximately 2.0, lessthan approximately 1.5, and/or the like.

In some implementations, optical filter coating portion 510 may beassociated with a particular quantity of layers, m. For example, anoptical filter for use as a sensor window may include a quantity ofalternating high refractive index layers and low refractive indexlayers, such as a range of 2 layers to 200 layers. In someimplementations, optical filter coating portion 510 may be fabricatedusing a sputtering procedure. For example, optical filter coatingportion 510 may be fabricated using a pulsed-magnetron based sputteringprocedure to sputter alternating layers 530 and 540 on a glasssubstrate, a silica substrate, or another type of substrate. In someimplementations, multiple cathodes may be used for the sputteringprocedure, such as a first cathode to sputter silicon and a secondcathode to sputter germanium, thereby forming a silicon-germanium layer.In some implementations, optical filter coating portion 510 may includeone or more other types of layers to provide one or more otherfunctionalities, such as a hydrophobic layer, an oleophobic layer, aprotective layer (e.g., a coating disposed on top of optical filtercoating portion 510), an anti-reflectance layer, an out of band blockerlayer (e.g., to block a particular spectral range), and/or the like. Insome implementations, substrate 520 may be chemically strengthened glassto provide protection to one or more sensor elements covered bysubstrate 520.

In some implementations, optical filter coating portion 510 may beannealed using one or more annealing procedures, such as a firstannealing procedure at a temperature of approximately 280 degreesCelsius or between approximately 200 degrees Celsius and approximately400 degrees Celsius, a second annealing procedure at a temperature ofapproximately 320 degrees Celsius or between approximately 250 degreesCelsius and approximately 350 degrees Celsius, and/or the like.

In some implementations, each layer of optical filter coating portion510 may be associated with a particular thickness. For example, layers530 and 540 may each be associated with a thickness of between 1 nm and1500 nm, between 10 nm and 500 nm, and/or the like. Additionally, oralternatively, optical filter 500 may be associated with a thickness ofbetween 100 μm and 5 millimeters (mm), less than approximately 3 mm,less than approximately 1 mm, and/or the like. In some implementations,at least one of layers 530 and 540 may each be associated with athickness of less than 1000 nm, less than 100 nm, or less than 5 nm,and/or the like. Additionally, or alternatively, optical filter coatingportion 510 may be associated with a thickness of less than 100 μm, lessthan 50 μm, less than 10 μm, and/or the like.

In some implementations, a layer may be associated with multipledifferent thicknesses. For example, to form a set of channels, athickness of a particular layer (e.g., a spacer layer disposed between aset of quarterwave stack reflectors formed by layers 530 and layers 540)may be varied to cause different wavelengths of light to be directed todifferent sensor elements of a sensor element array via differentchannels. In this way, a sensor window may enable use of a multispectralsensor to determine information regarding multiple wavelengths of lightand to perform multiple sensing functionalities. In someimplementations, optical filter 500 may form at least 32 channels, atleast 64 channels, at least 128 channels, and/or the like to enablesensing of a threshold quantity of wavelengths. In some implementations,multiple channels may be associated with a common wavelength (e.g., onecommon wavelength, at least one common wavelength, and/or the like) forsensing by at least one sensor element aligned to the multiple channels.

In some implementations, optical filter 500 may be associated with aparticular spectral range, such as a near-infrared spectral range, amid-infrared spectral range, and/or the like. For example, opticalfilter 500 may be associated with a spectral range from approximately600 nm to approximately 2500 nm, from approximately 600 nm toapproximately 1100 nm, from approximately 700 nm to approximately 2000nm, from approximately 900 nm to approximately 1500 nm, and/or the like.In some implementations, optical filter 500 may be associated with aparticular channel separation, such as a channel separation of less thanapproximately 50 nm, less than approximately 20 nm, less thanapproximately 10 nm, less than approximately 5 nm, less thanapproximately 1 nm, and/or the like.

In some implementations, optical filter 500 may be associated with athreshold transmissivity, such as greater than approximately 50%transmissivity, greater than approximately 80% transmissivity, greaterthan approximately 90% transmissivity, greater than approximately 95%transmissivity, greater than approximately 99% transmissivity, and/orthe like for a particular spectral range (e.g., a sensing spectralrange). In some implementations, optical filter 500 may be associatedwith a threshold opacity (e.g., based on reflectance, absorption, and/orthe like). For example, optical filter 500 may be associated with anopacity of greater than approximately 50% transmissivity, greater thanapproximately 80% transmissivity, greater than approximately 90%transmissivity, greater than approximately 95% transmissivity, greaterthan approximately 99% transmissivity, and/or the like for a particularspectral range (e.g., a visible spectral range). In this way, opticalfilter 500 enables color-selectivity for a sensor window and enablessensing by a sensor element disposed in an optical path of the sensorwindow.

As indicated above, FIG. 5 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 5.

In this way, a user device may include a single, multispectral sensordevice aligned to a multispectral filter to provide multiple sensingfunctionalities, such as biometric authentication sensing, healthparameter monitoring sensing, and/or the like. Based on providingmultiple sensing functionalities using a single, multispectral sensordevice, the user device may be associated with reduced cost, reducedsize, reduced complexity, reduced utilization of power resources,reduced utilization of network resources, and/or the like. Moreover,based on performing biometric authentication using subcutaneousspectroscopic measurements, the sensor device improves an accuracy ofbiometric authentication by obviating an effect of surface damage to afinger, dirt on a finger, water on a finger, and/or the like, and byusing liveness detection to prevent an artificial imprint of a fingerfrom being used in place of the finger.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the implementations to theprecise form disclosed. Modifications and variations are possible inlight of the above disclosure or may be acquired from practice of theimplementations.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, or a combination of hardware and software.

Some implementations are described herein in connection with thresholds.As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, more than thethreshold, higher than the threshold, greater than or equal to thethreshold, less than the threshold, fewer than the threshold, lower thanthe threshold, less than or equal to the threshold, equal to thethreshold, and/or the like.

Certain user interfaces have been described herein and/or shown in thefigures. A user interface may include a graphical user interface, anon-graphical user interface, a text-based user interface, or the like.A user interface may provide information for display. In someimplementations, a user may interact with the information, such as byproviding input via an input component of a device that provides theuser interface for display. In some implementations, a user interfacemay be configurable by a device and/or a user (e.g., a user may changethe size of the user interface, information provided via the userinterface, a position of information provided via the user interface,and/or the like). Additionally, or alternatively, a user interface maybe pre-configured to a standard configuration, a specific configurationbased on a type of device on which the user interface is displayed,and/or a set of configurations based on capabilities and/orspecifications associated with a device on which the user interface isdisplayed.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the implementations. Thus, the operation and behaviorof the systems and/or methods are described herein without reference tospecific software code—it being understood that software and hardwarecan be used to implement the systems and/or methods based on thedescription herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of possible implementations. In fact,many of these features may be combined in ways not specifically recitedin the claims and/or disclosed in the specification. Although eachdependent claim listed below may directly depend on only one claim, thedisclosure of possible implementations includes each dependent claim incombination with every other claim in the claim set.

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the term “set” is intended to include one or more items(e.g., related items, unrelated items, a combination of related items,and unrelated items, etc.), and may be used interchangeably with “one ormore.” Where only one item is intended, the term “only one” or similarlanguage is used. Also, as used herein, the terms “has,” “have,”“having,” or the like are intended to be open-ended terms. Further, thephrase “based on” is intended to mean “based, at least in part, on”unless explicitly stated otherwise.

What is claimed is:
 1. A device, comprising: a sensor window,comprising: a substrate; and a set of layers disposed onto thesubstrate, wherein the set of layers includes a first subset of layersof a first refractive index and a second set of layers of a secondrefractive index different from the first refractive index, wherein theset of layers is associated with a threshold transmissivity in a sensingspectral range, and wherein the set of layers is configured to aparticular color in a visible spectral range and is associated with athreshold opacity in the visible spectral range; and a spectral sensordevice aligned to the sensor window, comprising: at least one sensorelement to receive light in the sensing spectral range and provide aplurality of sensing functionalities based on at least one measurementof the light in the sensing spectral range.
 2. The device of claim 1,wherein the device is at least one of: a user device, a mobile phone, acomputer, a gaming device, a wearable communication device, a smartwristwatch, or a pair of smart eyeglasses.
 3. The device of claim 1,wherein the plurality of sensing functionalities includes a biometricauthentication functionality and a health parameter monitoringfunctionality.
 4. The device of claim 1, wherein the plurality ofsensing functionalities includes a subcutaneous identification of atissue structure.
 5. The device of claim 4, wherein the subcutaneousidentification is associated with a penetration depth of at least 3microns.
 6. The device of claim 1, wherein the threshold transmissivityis greater than approximately 80% in the sensing spectral range.
 7. Thedevice of claim 1, wherein the sensing spectral range is fromapproximately 600 nanometers to approximately 1100 nanometers.
 8. Thedevice of claim 1, wherein the threshold opacity is greater than 80% inthe visible spectral range.
 9. The device of claim 1, wherein the set oflayers includes at least one of: a germanium layer, a silicon-germaniumlayer, a hydrogenated silicon layer, a hydrogenated germanium layer, ahydrogenated silicon-germanium layer a silicon layer, a silicon dioxide(SiO₂) layer, an aluminum oxide (Al₂O₃) layer, a titanium dioxide (TiO₂)layer, a niobium pentoxide (Nb₂O₅) layer, a tantalum pentoxide (Ta₂O₅)layer, a magnesium fluoride (MgF₂) layer, or a niobium titanium oxide(NbTiO) layer.
 10. The device of claim 1, wherein the first refractiveindex is greater than approximately 3.5.
 11. The device of claim 1,wherein the second refractive index is less than approximately 2.0. 12.The device of claim 1, wherein the substrate is chemically strengthenedglass.
 13. The device of claim 1, wherein the sensor window includes atleast one of: a hydrophobic layer, an oleophobic layer, a protectivelayer, an anti-reflectance layer, or an out of band blocker layer. 14.An optical device, comprising: a plurality of sensor elements; and aplurality of layers, wherein the plurality of layers includes a set ofhigh refractive index layers associated with a first refractive indexand a set of low refractive index layers associated with a secondrefractive index that is less than the first refractive index, whereinthe plurality of layers form a plurality of channels to direct aplurality of wavelengths of light, wherein the plurality of layers isassociated with a threshold transmissivity in a sensing spectral rangeand a threshold opacity in a visible spectral range, wherein theplurality of sensor elements are aligned to the plurality of channelsand are configured to perform a health parameter monitoringdetermination and a biometric identification determination based onmeasurements of the plurality of wavelengths of light.
 15. The opticaldevice of claim 14, wherein the plurality of sensor elements areconfigured to perform a surface measurement of a surface of an object ora subsurface measurement of a characteristic beneath the surface of theobject.
 16. The optical device of claim 14, wherein the plurality ofchannels includes at least 32 channels.
 17. A sensor device, comprising:a sensor element array including a plurality of sensor elements, whereinthe sensor element array is configured to perform a plurality ofmeasurements of a plurality of wavelengths of light, and wherein thesensor element array is configured to provide information identifying aplurality of characteristics of an object based on the plurality ofmeasurements; and a multispectral filter including a set of highrefractive index layers and low refractive index layers, wherein themultispectral filter is configured to direct the plurality ofwavelengths of light to the sensor element array.
 18. The sensor deviceof claim 17, wherein the plurality of characteristics include at leasttwo of: a biometric authentication, a heart rate determination, aliveness detection determination, a blood pressure determination, or ablood oxygenation determination.
 19. The sensor device of claim 17,wherein the sensor device is disposed behind a display of a user device.20. The sensor device of claim 17, wherein the sensor element array isconfigured to perform a first characteristic determination, of a firstcharacteristic of the plurality of characteristics, based on a firstsubset of the plurality of wavelengths, and a second characteristicdetermination, of a second characteristic of the plurality ofcharacteristics, based on a second subset of the plurality ofwavelengths, wherein the first characteristic is different from thesecond characteristic, and wherein the first subset of the plurality ofwavelengths and the second subset of the plurality of wavelengthsinclude one common wavelength.